diff --git a/.changelog/30828.txt b/.changelog/30828.txt
new file mode 100644
index 00000000000..f31aee9c765
--- /dev/null
+++ b/.changelog/30828.txt
@@ -0,0 +1,7 @@
+```release-note:breaking-change
+resource/aws_autoscaling_attachment: `alb_target_group_arn` has been removed -- use `lb_target_group_arn` instead
+```
+
+```release-note:note
+resource/aws_autoscaling_attachment: Update configurations to use `lb_target_group_arn` instead of `alb_target_group_arn` which has been removed
+```
\ No newline at end of file
diff --git a/internal/service/autoscaling/attachment.go b/internal/service/autoscaling/attachment.go
index 0658e438ad1..66ef21e1172 100644
--- a/internal/service/autoscaling/attachment.go
+++ b/internal/service/autoscaling/attachment.go
@@ -24,13 +24,6 @@ func ResourceAttachment() *schema.Resource {
 		DeleteWithoutTimeout: resourceAttachmentDelete,
 
 		Schema: map[string]*schema.Schema{
-			"alb_target_group_arn": {
-				Type:         schema.TypeString,
-				ForceNew:     true,
-				Optional:     true,
-				Deprecated:   "Use lb_target_group_arn instead",
-				ExactlyOneOf: []string{"alb_target_group_arn", "elb", "lb_target_group_arn"},
-			},
 			"autoscaling_group_name": {
 				Type:     schema.TypeString,
 				ForceNew: true,
@@ -40,13 +33,13 @@ func ResourceAttachment() *schema.Resource {
 				Type:         schema.TypeString,
 				ForceNew:     true,
 				Optional:     true,
-				ExactlyOneOf: []string{"alb_target_group_arn", "elb", "lb_target_group_arn"},
+				ExactlyOneOf: []string{"elb", "lb_target_group_arn"},
 			},
 			"lb_target_group_arn": {
 				Type:         schema.TypeString,
 				ForceNew:     true,
 				Optional:     true,
-				ExactlyOneOf: []string{"alb_target_group_arn", "elb", "lb_target_group_arn"},
+				ExactlyOneOf: []string{"elb", "lb_target_group_arn"},
 			},
 		},
 	}
@@ -75,16 +68,9 @@ func resourceAttachmentCreate(ctx context.Context, d *schema.ResourceData, meta
 			return sdkdiag.AppendErrorf(diags, "attaching Auto Scaling Group (%s) load balancer (%s): %s", asgName, lbName, err)
 		}
 	} else {
-		var targetGroupARN string
-		if v, ok := d.GetOk("alb_target_group_arn"); ok {
-			targetGroupARN = v.(string)
-		} else if v, ok := d.GetOk("lb_target_group_arn"); ok {
-			targetGroupARN = v.(string)
-		}
-
 		input := &autoscaling.AttachLoadBalancerTargetGroupsInput{
 			AutoScalingGroupName: aws.String(asgName),
-			TargetGroupARNs:      aws.StringSlice([]string{targetGroupARN}),
+			TargetGroupARNs:      aws.StringSlice([]string{d.Get("lb_target_group_arn").(string)}),
 		}
 
 		_, err := tfresource.RetryWhenAWSErrMessageContains(ctx, d.Timeout(schema.TimeoutCreate),
@@ -94,7 +80,7 @@ func resourceAttachmentCreate(ctx context.Context, d *schema.ResourceData, meta
 			ErrCodeValidationError, "update too many")
 
 		if err != nil {
-			return sdkdiag.AppendErrorf(diags, "attaching Auto Scaling Group (%s) target group (%s): %s", asgName, targetGroupARN, err)
+			return sdkdiag.AppendErrorf(diags, "attaching Auto Scaling Group (%s) target group (%s): %s", asgName, d.Get("lb_target_group_arn").(string), err)
 		}
 	}
 
@@ -112,16 +98,9 @@ func resourceAttachmentRead(ctx context.Context, d *schema.ResourceData, meta in
 	var err error
 
 	if v, ok := d.GetOk("elb"); ok {
-		lbName := v.(string)
-		err = FindAttachmentByLoadBalancerName(ctx, conn, asgName, lbName)
+		err = FindAttachmentByLoadBalancerName(ctx, conn, asgName, v.(string))
 	} else {
-		var targetGroupARN string
-		if v, ok := d.GetOk("alb_target_group_arn"); ok {
-			targetGroupARN = v.(string)
-		} else if v, ok := d.GetOk("lb_target_group_arn"); ok {
-			targetGroupARN = v.(string)
-		}
-		err = FindAttachmentByTargetGroupARN(ctx, conn, asgName, targetGroupARN)
+		err = FindAttachmentByTargetGroupARN(ctx, conn, asgName, d.Get("lb_target_group_arn").(string))
 	}
 
 	if !d.IsNewResource() && tfresource.NotFound(err) {
@@ -159,16 +138,9 @@ func resourceAttachmentDelete(ctx context.Context, d *schema.ResourceData, meta
 			return sdkdiag.AppendErrorf(diags, "detaching Auto Scaling Group (%s) load balancer (%s): %s", asgName, lbName, err)
 		}
 	} else {
-		var targetGroupARN string
-		if v, ok := d.GetOk("alb_target_group_arn"); ok {
-			targetGroupARN = v.(string)
-		} else if v, ok := d.GetOk("lb_target_group_arn"); ok {
-			targetGroupARN = v.(string)
-		}
-
 		input := &autoscaling.DetachLoadBalancerTargetGroupsInput{
 			AutoScalingGroupName: aws.String(asgName),
-			TargetGroupARNs:      aws.StringSlice([]string{targetGroupARN}),
+			TargetGroupARNs:      aws.StringSlice([]string{d.Get("lb_target_group_arn").(string)}),
 		}
 
 		_, err := tfresource.RetryWhenAWSErrMessageContains(ctx, d.Timeout(schema.TimeoutCreate),
@@ -178,7 +150,7 @@ func resourceAttachmentDelete(ctx context.Context, d *schema.ResourceData, meta
 			ErrCodeValidationError, "update too many")
 
 		if err != nil {
-			return sdkdiag.AppendErrorf(diags, "detaching Auto Scaling Group (%s) target group (%s): %s", asgName, targetGroupARN, err)
+			return sdkdiag.AppendErrorf(diags, "detaching Auto Scaling Group (%s) target group (%s): %s", asgName, d.Get("lb_target_group_arn").(string), err)
 		}
 	}
 
diff --git a/internal/service/autoscaling/attachment_test.go b/internal/service/autoscaling/attachment_test.go
index 2f8ac4ff7d1..3c78e26fd4d 100644
--- a/internal/service/autoscaling/attachment_test.go
+++ b/internal/service/autoscaling/attachment_test.go
@@ -128,12 +128,10 @@ func testAccCheckAttachmentDestroy(ctx context.Context) resource.TestCheckFunc {
 
 			var err error
 
-			if targetGroupARN := rs.Primary.Attributes["lb_target_group_arn"]; targetGroupARN == "" {
-				targetGroupARN = rs.Primary.Attributes["alb_target_group_arn"]
-
-				err = tfautoscaling.FindAttachmentByTargetGroupARN(ctx, conn, rs.Primary.Attributes["autoscaling_group_name"], targetGroupARN)
+			if lbName := rs.Primary.Attributes["elb"]; lbName != "" {
+				err = tfautoscaling.FindAttachmentByLoadBalancerName(ctx, conn, rs.Primary.Attributes["autoscaling_group_name"], lbName)
 			} else {
-				err = tfautoscaling.FindAttachmentByLoadBalancerName(ctx, conn, rs.Primary.Attributes["autoscaling_group_name"], rs.Primary.Attributes["elb"])
+				err = tfautoscaling.FindAttachmentByTargetGroupARN(ctx, conn, rs.Primary.Attributes["autoscaling_group_name"], rs.Primary.Attributes["lb_target_group_arn"])
 			}
 
 			if tfresource.NotFound(err) {
@@ -173,12 +171,7 @@ func testAccCheckAttachmentByTargetGroupARNExists(ctx context.Context, n string)
 
 		conn := acctest.Provider.Meta().(*conns.AWSClient).AutoScalingConn()
 
-		targetGroupARN := rs.Primary.Attributes["lb_target_group_arn"]
-		if targetGroupARN == "" {
-			targetGroupARN = rs.Primary.Attributes["alb_target_group_arn"]
-		}
-
-		return tfautoscaling.FindAttachmentByTargetGroupARN(ctx, conn, rs.Primary.Attributes["autoscaling_group_name"], targetGroupARN)
+		return tfautoscaling.FindAttachmentByTargetGroupARN(ctx, conn, rs.Primary.Attributes["autoscaling_group_name"], rs.Primary.Attributes["lb_target_group_arn"])
 	}
 }
 
diff --git a/website/docs/r/autoscaling_attachment.html.markdown b/website/docs/r/autoscaling_attachment.html.markdown
index 41e23031a1d..0fb26bc6f49 100644
--- a/website/docs/r/autoscaling_attachment.html.markdown
+++ b/website/docs/r/autoscaling_attachment.html.markdown
@@ -60,7 +60,6 @@ The following arguments are supported:
 
 * `autoscaling_group_name` - (Required) Name of ASG to associate with the ELB.
 * `elb` - (Optional) Name of the ELB.
-* `alb_target_group_arn` - (Optional, **Deprecated** use `lb_target_group_arn` instead) ARN of an ALB Target Group.
 * `lb_target_group_arn` - (Optional) ARN of a load balancer target group.
 
 ## Attributes Reference